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. Author manuscript; available in PMC: 2013 Jul 9.
Published in final edited form as: Int J Mol Med. 2005 Mar;15(3):443–448.

Table 1.

Distribution of subjects according to demographic characteristics.

Control COPD P value
N 262 131
Mean age (yr) 61 64 0.001
<50yrs 14 (5)1 4 (3)
50–59 102 (39) 28 (21)
60–69 106 (40) 64 (49)
70yrs≤ 40 (16) 35 (27)
Gender (M/F) 169/93 98/33 0.04
Mean FEV1/FVC Ratio ± SD 0.77 ± 0.04 0.56 ± 0.11 <0.001
Mean smoking (py) ± SD 49.7 ± 28.2 64.1 ± 26.3 <0.001
1

Numbers in parenthesis denote percentages.